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Contents
module Distribution
# Calculate cdf and inverse cdf for T Distribution.
# Uses Statistics2 Module.
module T
class << self
# Return the P-value of the corresponding integral with
# k degrees of freedom
def p_value(pr,k)
Statistics2.ptdist(k, pr)
end
# T cumulative distribution function (cdf).
#
# Returns the integral of t-distribution
# with n degrees of freedom over (-Infty, x].
#
def cdf(x,k)
Statistics2.tdist(k, x)
end
end
end
end
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20 entries across 20 versions & 1 rubygems